Pigeon Genetics Worksheet (Answer)

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Answer Key
Learn.Genetics.utah.edu
GENETIC SCIENCE LEARNING CENTER
Date:
Pigeon Genetics
Student Worksheet
Answer the following. Use information from Pigeon Breeding: Genetics at Work on the
Learn.Genetics website to learn more about each inherited characteristic.
Crest
The crest characteristic in pigeons has two alleles: ‘crest’ and ‘no crest’. ‘crest’ is
recessive. Calculate the probability of the offspring of two heterozygous parents having a
crest.
Using a Punnett Square:
Probability of offspring having a crest:
1/4
x possible ‘crest’ alleles from mother
1
X
=1/4
2
Using Math: Possible ‘crest’ alleles from father
1
2
© 2014 University of Utah
Pigeon Genetics - Student Worksheet
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Name:
Answer Key
Learn.Genetics.utah.edu
GENETIC SCIENCE LEARNING CENTER
Date:
Crest
Explain how the following work together to give a pigeon a crest using the following words:
‘crest’ alleles, protein (for a bonus include: nucleotide and amino acid sequence):
answers will vary
Foot Feathering
The Slipper characteristic is partially dominant, meaning what we see is the product of
both alleles that are inherited.
The ‘No Grouse’ characteristic is dominant.
Draw the foot feathering you’d see on a pigeon with the ‘slipper’, ‘no slipper’ and
‘grouse’, ‘no grouse’ genotype.
What is the genotype of the foot feathering seen here?
‘slipper’ , ‘slipper’
‘grouse’ , ‘grouse’
© 2014 University of Utah
Pigeon Genetics - Student Worksheet
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Name:
Answer Key
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GENETIC SCIENCE LEARNING CENTER
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Wing Pattern
Wing pattern is determined by four alleles that follow a hierarchy of dominance.
The Pattern gene
comes in 4 versions:
‘T-check’ allele
‘Check’ allele
‘Bar’ allele
‘Barless’ allele
More dominant
Wing Pattern
Draw the correct phenotype for each genotype below.
Genotype
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Phenotype
Genotype
Phenotype
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Color
Color is determined mainly by one gene on the sex chromosome Z. This is known as
‘sex-linked.”
In addition, Color alleles have a hierarchy of dominance. In order of most to least dominant
they are: ‘ash red,’ ‘blue,’ ‘brown’
Color
Calculate the probability of female offspring of the following cross NOT being red. Use a
Punnett square or math.
Color gene
comes in 3 versions:
Z chromosome
‘Ash-red’ allele
‘Blue’ allele
‘Brown’ allele
W chromosome:
No color gene
More dominant
Male —
Genotype
Z
Female —
Z
Phenotype
Genotype
Ash-red
Z
W
Phenotype
Ash-red
Probability is 1/4
© 2014 University of Utah
Pigeon Genetics - Student Worksheet
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Name:
Answer Key
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Date:
Spread
Pigment distribution is determined by the Spread
gene, the ‘spread’ allele being dominant to ‘no
spread’. The ‘spread’ allele masks underlying
wing pattern, which is known as epistasis.
Circle the parental genotypes that could possibly
produce the offspring shown:
Possible parental genotypes:
© 2014 University of Utah
Pigeon Genetics - Student Worksheet
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Name:
Answer Key
Learn.Genetics.utah.edu
GENETIC SCIENCE LEARNING CENTER
Date:
Recessive Red
The Recessive Red gene also determines feather
color and is different from the Color gene. The
recessive red characteristic is recessive (meaning
two copies of the allele must be inherited) and
epistatic to wing pattern.
Calculate the probability that offspring from the
following cross will show a wing pattern. Circle the
genotypes that would show a wing pattern.
The Recessive Red gene
comes in 2 versions:
‘Not recessive red’
allele (dominant)
Probability is 3/4
‘Recessive red’ allele
(recessive)
Dilute
The Dilute gene also influences color, making some pigeons a lighter shade of their inherited
feather color. The Dilute gene is sex-linked, residing on the Z chromosome and has two alleles:
‘dilute’ and ‘not dilute’.
Calculate the probability of male offspring of the following cross being a lighter shade. Use a
Punnett square or math.
Female
Male
Dilute
Dilute
Color
Color
Z
Z
Z
W
Probability is 2/2 or 100%
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